IDF claims it captured terror operative in Syria

Baalbek's 80,000 residents were given just under four hours to leave the city before Israeli strikes on the region began.

Residents received a message in Arabic telling them to evacuate their homes and move outside the city and villages "immediately."

The Israel Defense Forces said it struck a fuel depot in Baalbek "located inside military compounds" belonging to Hezbollah.

"These fuel depots supplied fuel for Hezbollah’s military vehicles and were critical to the operation of Hezbollah’s military infrastructure. The fuel at these sites was supplied by Iran as part of its military support for Hezbollah," the IDF said in a statement.

The World Health Organization has continued to evacuate patients from the Kamal Adwan Hospital in northern Gaza, as the hospital continues to receive "a constant stream of trauma patients due to ongoing hostilities in the area," said Dr. Tedros Adhanom Ghebreyesus, the WHO director-general, Wednesday.

There are now only two surgeons left at the hospital. The WHO has transferred 23 critical patients to Al-Shifa Hospital and 16 patients from Al-Shifa to Nasser Medical Complex in a multiday mission to north Gaza in the past two days.

The Kamal Adwan Hospital building and equipment sustained damage during the most recent siege and its four ambulances were destroyed.

"We have provided medical supplies, food and water for patients at Kamal Adwan Hospital -- but much more is needed. Additionally, this week we have also provided 40,000 liters of fuel and medical supplies for six hospitals in Gaza City," the director-general said.

The Israel Defense Forces issued an evacuation warning for residents in the entire eastern Lebanese city of Baalbeck and the surrounding areas and key routes into the Bekaa Valley. This includes the ancient Roman temple complex, which is a UNESCO World Heritage Site.

The deliberate targeting of a World Heritage Site is a war crime under international law.

Residents have been told to evacuate their homes "immediately" and move outside the city and villages, according to the evacuation warning.

There are nearly 80,000 residents in the city, adding to the hundreds of thousands of people in Lebanon who are already displaced.

An airstrike on a residential building that killed at least 110 people in Beit Lahia in north Gaza on Tuesday -- per figures from the Hamas-run Gaza Ministry of Health -- was targeting a person acting suspiciously on its roof, an Israeli military official told ABC News.

The official said they did not know there were so many people in the building, as everyone in the area had already been told to leave.

The official added they were skeptical of the death toll provided by the Gaza Ministry of Health, a sentiment expressed by the Israel Defense Forces in a public statement regarding the incident.

State Department spokesperson Matthew Miller on Tuesday described the strike as a "horrifying incident with a horrifying result."

Emergency responders said the airstrike hit a five-story building housing displaced people, with at least 25 children among the dead. Many more people are still missing, officials said.

-ABC News' Britt Clennett